Pump



Dec. 21, 1943. T. H. THOMPSON PUMP Filed July 24, 1941 2 Sheets-Sheet l I NV EN TOR.

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PUMP

- Filed July 24, 1941 2 Sheets-Sheet 2 ATTORNEYS Patented Dec. 21, 1943 UNITED PATENT OFFICE Tom H. Thompson, Deroit, Mich., assignor, 'by mesne assignments, 'tof-Builder Thompson Engineering' and Res'ea ch;Corporation, Detroit, Mich, a corporatio 'of Michigan Application July 241-1941; sens; Nd. 102,896

12 Claims. Y (CL- 103 461 The present invention relates to fluid pumps and more especially to multiple cylinder reciproeating pumps of the rotary type.

Among the objects of the invention duction of a pump of greater efiiciency than known pumps by providing for straight line reciprocation of the pistons in the several cylinis the pro-J piston pump which is inand slightly tapered, and at its. closed end pro .vided withan opening l5a through which may passthe. drive shaft for the rotor. 1

The rotor 20 consists ofa cup-shaped cylinder carrier 2|, shown in Figure 4, slightly tapered to fit the housing and provided with a plurality of radially bored cylinders 22,

there being in the sixcylinder form three pairs arranged 120 degrees apart and-having the members of each pair at 180 degrees, and is provided at its closed end with a sleeve-like coaxial'extension Zla with a rather large bore 2lb.

The-rotor 20 is mounted in the housing l5 on antifriction bearings 23, with the extension 2Ia Another object is a pump which will handle ef- I ficiently any fluid, whether gas, liquid or a mixture of the two.

Another object is a pump having greater delivery capacity for its size than those heretofore known and used.

Other objects and advantages will readily appear to those skilled in the art upon reference to the following description and drawings in which Figure l is a section through the pump on line l-l of Figure 2.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is a plan view from the cover plate side of the pump.

Figures 4 to 90 shows details of construction, Figures 6 and 7 being, respectively, a side elevation and end view of the cam assembly.

In the drawings, an embodiment at the invention is shown as consisting of a pump housing l5 provided with an inlet and an outlet l6 and II respectively. These may be used in reverse order as will appear later. The housing i5 is, as shown, so made as to provide ample clearance around the rotor, indicated as a whole by the numeral 20, except for the abbreviated bearing walls I8 located midway between the openings l6 and I1, and these bearing walls, while they may be integral, are preferably made of separate pieces dove tailed in the housing wall proper, such dovetailing being indicated at l8a.

In mounting the pieces l8, it is sometimes desirable to coat the dovetail, at least on its rear.-

ward face, with a thin coating of a resilient material unaffected by the fluid to be pumped; so as Q to provide a slight resilient pressure between these pieces and the rotor. I

As shown, the housing i5 is open at one end arranged coaxially with the opening |5a in the closed end of the housing l5, and to the extension is fixed in axial alignment the drive shaft 25, the

latter extending through opening 15a and being.

provided with a suitable packing ring 25a.

The housing I5 is closed at the end opposite opening I5a by means of a cover plate |5b provided with a seat for a bearing 23 and also an eccentrically located socket I50 in which is keyed one end of a shaft 30, a suitable screw 30a being used to hold the shaft in the socket. The shaft 30 has at its other end an eccentric enlargement 3| adapted to extend into and have a bearing in the sleeve extension Zla of cylinder carrier 2|, suitable antifriction elements 32 being used.

Mounted upon the shaft 30 on antifriction rollers 33 is an assembly of three eccentrics or circular cams 35, doweled or otherwise fixed together with their lobes at oblique angles, in the form shown they are degrees apart, and upon each of the cams is mounted a ring 36, using antifriction rollers 31. These rings 36 each carry a pair of pistons 38 which may be integral with the ring or detachable as indicated in Figure 8 atv 38a. The pistons of each pair are diametrically opposite and each pair is adapted to be actuated in a pair of cylinders 22.

As stated above, the rotor assembly 20 and housing l5, that is, the bearing surfaces l8, are slightly tapered so that any wear may be compensated for by adjusting the position of the rotor. Such adjustment is preferably accomplished by the use of shims at the points indicated by the numerals 40 and 4|, these being, respectively, at the edge of cover I51) and between the body of rotor number 2! and the' inner race of the lower (Fig. 1) antifriction bearing 23.

with grooves a, 1451), or

metal marketed under the trade name of Oilite." These rings are indicated at 45.

The rings 45, while they may have plane surfaces, are however, preferably surfaced on one or both bearing surfaces as shown in Figs. 9A, 9B and 90 which show the rings to be provided H50, i. e., with radial grooves H511. extending part wayacross the ring, spiral grooves [45b extending part way across, or radial or other grooves i450 extending all the way across the rings.

Since the rings 45, rotate, the provision of vanes, by the grooving, converts the rings into a centrifugal pump and prevents leakage from pump chambers into the v 25 and the lower bearing '23. rotation of the space around shaft In the operation of the pump,

shaft 25, and thereby the rotor assembly, in a clockwise direction (see Fig. 2) while the eccentrically placed shaft 30 is held stationary, will produce a clockwise movementof a cam 35 at twice rotor speed, anda consequent movement inward of the piston 13, the piston A moving outwardly simultaneously therewith. The now, in such case will be toward the left hand port or opening l1. i

' This action of the .two eccentrics or camshaft 30 and cam 35 is insured by the multiple arrangement at angles greater than 90 degrees. If, however, more than four camsare used, they could be at an angle of less than 90 degrees. 'In the present case and in such other cases, there will always be excitation, in the proper direction, of the cam assembly' by one or more of the cams.

As stated above, the movement of the rotor, in a clockwise direction results in fluid fiow from right to left. This is,:however, the case because of the illustrated assembly of the parts. 7 If, however, the cover b is rotated 180 degrees, the eccentricity of shaft 3 will be also rotated '180 degrees and the result will be that flowiwill be in the reverse direction, namelyyfrom left to right (Fig. 2). r v

The mechanical movement shown and described as the pump piston operating means is not claimed herein except as part of a pump construction as it is described and claimed in my application Ser. No. 481,336, filed March 31, 1943, as a division of this application.

Now having described the inventionand the preferredembodiment, it is to be understood that said invention is to be limited, not to the specific details herein set forth, but only by the scope of the claims which follow.

I claim:

1 In a pump, a fixed circular cam, a plurality" of secondary circular cams fixed together and mounted. for rotation around said fixed cam and having their lobes equally angularly spaced, rings surrounding each of said secondary cams, a radially arranged piston fixed to each ring, an annular cylinder carrier surrounding said rings and provided with a radially arranged cylinder for each of said pistons, and means for rotating said cylinder carrierabout its axis.

.2. A pump consisting and outlet ports and enclosing an annular rotor, radial pump cylinders carried by said rotor in pairs arranged diametrically, annulus, each having tons corresponding to a pair of cylinders and movable therein, a circular cam in each ring, said latter cams being fixed together with their lobes radially displaced atan oblique angle, a fixed ecduring pump operation, also ringswithin said' fixed thereto a pair of piscentric shaft passing through the same cams and means for rotating said rotor assembly around said shaft.

3. In a pump, a fixed primary circular cam, a freely movable secondary circular cam surrounding the primary cam and actuable thereby, a cam ring surrounding the secondary cam and actuable thereby; said ring having fixed thereto a pair of diametrically arranged pistons, a rotatable annulus enclosing said ring and provided with cylinders for said pistons, means for rotating said annulus around said fixed cam whereby to reciprocate said pistons in said cylinders, and means for exciting movement of said secondary cam, said exciting means consisting of a second secondary cam fixed coaxially to the first and in oblique angular relation thereto and actuable by the primary cam, there being a cam ring, pistons and cylinders arranged to coact with said second secondary cam in like relation as with the first secondary cam.

4. In a pump, a coactlng series of elements consisting of a fixed inner primary circular cam. a freely movable circular secondary cam surrounding the primary cam and actuable thereby. a cam ring surrounding said secondary cam and carrying a piston, a cylinder in which said piston is reciprocable, an annular rotatable carrier for said cylinder, means for rotating said annulus around said fixed cam, and a plurality of identical series of elements having the fixed primary cam common to all the series and having their secondary cams'fixed together coaxially and in oblique angular relation to each other.

5. In a pump, a coacting series of elements consisting of a fixed inner primary circular cam, a freely movable circular secondary cam surrounding the primary cam and actuable thereby,

a cam ring surrounding said secondary cam and carrying a piston, a cylinder in which said piston is 'reciprocable, an annular rotatable carrier for said cylinder, means for rotating said annulus around said fixed cam, and a plurality of identical series of elements having the fixed primary cam common to all the series and having their secondary cams fixed together coaxially and in oblique angular relation to each other, there being a total of at least three of said series.

6. In a rotary pump, a housing having spaced inlet and outlet openings, a rotor mounted in said housing and in contact with portions of the inner housing wall between said openings to thereby divide the space in said housing, separate wall'elements constituting the contact portions and resilient mounting means for said wallelements.

- tending through an opening in a wall of said of a housing having inlet housing, said rotor and housing wall adjacent said opening forming a chamber around said shaft, and centrifugal pumping means adapted to force fiuid out of said chamber into said housing around the rotor.

8. In a pump, an annular rotatable member having a pair of cylinders radially arranged and diametrically located therein, a stationary shaft extending through said member with its axis parallel with and eccentric to the axis of said member, a pair of pistons reciprocable in said cylinders, a circular ring upon which said pistons are fixed, a freely rotatable circular cam between said ring and said shaft, means for rotating said annular member, and means for causing said circular cam to rotate in the same direction at twice the member speed.

9. In combination, a housing, an annular member rotatably mounted in said housing, said memher having a pair of cylinders radially arranged and diametrically located therein, a stationary shaft extending into said member with its axis parallel with and eccentric to the axis of rotation oi said member, said shaft being supported from said housing and from said member, pis tons reciprocable in said cylinders, a circular ring connecting said pistons, a rotatable circular cam between said ring and said shaft and means for rotating said member.

9. In combination, a housing, an annular member rotatably mounted in said housing, said member having a cylinder arranged therein, a shaft extending into said member with its axis parallel with and eccentric to the axis-0f rotatlon of said member, said shaft having one end fixed to said housing, and the other end supported from said member, a piston reciprocab e in i said cylinder, means for rotating said member and means operatively connecting said piston and said shaft for reciprocating said piston upon ro- 5 tation of said member.

, said piston from said shaft 11. In combination, a housing, an annular member rotatably mounted in said housing, said member having a cylinder arranged therein, a piston in said cylinder, means for rotating said member, a stationary shaft extending into said member and having its axis parallel with and eccentric to the axis of rotation of said member, means supporting an end of said shaft from said housing, means supporting an end or" said shaft from a rotatable part, and means connecting said shaft and piston for operation of said piston upon rotation of said member.

12. In combination, a housing, an annular member rotatably mounted in said housing, said member having a cylinder arranged therein, a piston in said cylinder, means for rotating said member, a stationary shaft extending into said member and having its axis parallel with and eccentric to the axis of rotation of said member, means supporting said shaft from said housing and, a rotatable part and means for operating upon rotation of said member.-

TOM H. THOMSON. 

